Lathe or the like



March 20, 1934. J. E. LOVELY 1,951,514

LATHE QR THE LIKE Filed Oct. 14, 1931 2 Sheets-Sheet l March 20 1934. J E, LOVELY LATHE OR THE LIKE FilGd Oct; 14, 1931 2 Sheet -s 2 T r Jiaajjayg -.V I [M 0 1 WV 2; 2 7 01 r f 2 k W V a wvfl Patented Mar. 20, 1934 1,951,514 LATHE on THE- LIKE John E. Lovely, Springfield, Vt., assignor to Jones & Lamson Machine Company, Springfield, Vt., a corporation of Vermont Application October 14, 1931, Serial No. 568,726

7 Claims.

In usual lathe or similar machines the shears or ways for supporting the tool carriage are formed integral with the machine bed. As this is commonly cast iron these ways are relatively soft. It has been proposed to surface them, however, with thin strips of hardened steel so as to reduce wear. These strips heretofore have been relatively thin, being formed so as to take the weight but not the side thrust of the carriage. They have been attached to the bed by the use of soft screws passing therethrough and into the cast iron bed beneath, these screws being finished down to the plane of the top of the hard strip. It is very difiicult to thereafter remove these screws to permit the removal of the plates as when it is desired to resurface the ways, and the screws interpose soft metal spots in an otherwise hardened surface. It is necessary also to grind these strips in place after assembly, which is an awkward and expensive operation. It also very awkward and expensive to recondition the surface by regrinding as this would necessitate sending the machine back to the factory suitably equipped for this purpose. In some cases the strips have been dovetailed in a dovetail groove in the bed and pressed into place. This construction requires very accurate machining of the two parts to insure proper fit and when the strips are in place it is impossible to remove them.

In accordance with the present invention hardened wear strips capable of taking both vertical and lateral wear are provided and they are so secured to the bed as to permit ready removal thereof and in a manner to avoid the presentation of soft spots to wear. The bed itself may be surfaced accurately to a surface plate and this may be done at any time, as, for example, to correct distortion in the casting or to make corrections for wear or misalinement of spindle bearings or other parts.

For a more complete understanding of this invention, reference may be had to the accompanying drawings in which p Figure 1 is a diagrammatic transverse section of a lathe showing certain constructions embodying this invention.

Figure 2 is a view somewhat similar to a portion of Figure 1, but showing in part a modified construction.

Figures 3 and 4 are fragmentary top plans of and 6-6, respectively, of Figure 3.

is an upstanding rib 7. Supported on the flat faces 5 and 6 is a hardened wear strip 10, which, as shown, is provided with a top hardened face 11 and a hardened edge face 12. The outer edge 13 and face 16 may, if desired, also be hardened. This wear strip has flat wall faces 15 and 16 which rest fiat against the faces 5 and- 6 of the track member 1 and also has a groove 17 between the face portions 15 and 16 in which may extend the rib 7. The rib '7 and the strip 10 may .be provided with accurately machined engaging side faces 18 and 19, respectively, these side faces being accurately related to the spindle bearings or other parts so as to insure accurate positioning of the bearing face 12 to properly guide the carriage 3 in its traverse. The wear strip is held in position by screws 20 and 21. The screws 20 are arranged vertically and passed through openings 22 in an outwardly extending flange 23 at the upper end of the member 1 and are threaded into the .wear strip 10 entering thereinto gthro'ugh threaded holes in the face portion 16. The screws 21 are inclined inwardly extending beneath the mating edge faces 18 and 19, passing through inclined openings 25 in the member 1, and engaging in inclined threaded sockets 26 in the wear piece 10, entering the wear'piece through the face portion 15. The rib 7 presents a longitudinal shoulder 13 against which the face 19 on the member 10 is forced by the action of the screws 21, which have a component of motion pulling the wear piece 10 in that direction, as well as a component of motion holding the wear piece down firmly against the flat face 5 of the track member 1. The thrust of the tool carriage on a way so constructed is also in a direction to press the side face 19 of the wear strip firmly against theedge 18 of the rib 7 and this construction of the way is particularly applicable to the heavier types 01' machine tools where this lateral pressure is heavy.

The construction shown for the mating track portion 2 and for both track portions 30 and 31 of Figures 2, 4, 6, 7 and 8 is somewhat simplified but is not so suitable for heavy-machines. As therein shown the upper face of the track memsenting an accurate side face 37 against which the accurate face 38 of the wear strip 40 bears. This wear strip 40 is shown as secured in position by vertical bolts 41 passing through openings in the flange 42 outwardly extended from the upper edge of the track member, and by inclined bolts 43 which pass beneath the abutting edge face portions 37 and 38 and are threaded into the wear piece 40. The inclined screws 43 here also exert a component of pressure holding the wear piece 40 firmly up against the shoulder 36. This wear strip 40 is also provided not only with a flat hardened upper face but one or more hardened side faces as 38 and 45 which take the thrust of the tool carriage. In Figure 2 a gib is shown at 50 positioned between the tool carriage and the face 45, this gib therefore bearing on a hardened wear face.

In the construction as used in the track member 30 it will be noted that the pressure exerted by the carriage is away from the shoulder 36, the bolts 43 taking this lateral thrust, while for the wear member 31 the pressure of the carriage is usually such as to press the wear strip 40 against the shoulder 36, thus relieving the bolts 43 from stress incident to this action of the traversing carriage. In either construction, however, it will be noted that the wear piece is of sufficient thickness to present not only a hardened top face for taking the weight of the carriage but also a hardened side face for taking lateral thrust. It will also be noted that there are no holes extending through the top faces of the wear strip so that no soft spots produced by exposed ends of fastening means are presented. Moreover, it is a simple matter to remove the wear strips at any time so as to permit resurfacing of the track members at any time so as to correct, for distortions in the casting or for wear or misalinement of parts, and after such re-surfacing has been accomplished the wear strip may be replaced and accurately held against both the' vertical and horizontal trued surfaces by reason of the inclination of the securing screws 21 or 43.

The faces 5 and 6 and 35 are all in the same plane so that thesesurfaces may be accurately checked with a surface plate before the wear pieces are assembled onthe bed. The surfaces at the shoulders against which the wear pieces are drawn may also be checked with a surface plate to see that these aline properly with the spindle or other parts of the machine. 4

The constructions thus described are particularly well adapted. to machines that employ more than one carriage or tool carrying member on the-same set of ways as the engaging surfaces of the ways against which the carriages travel may be hardened all over so as to be practicallyindestructible from wear. I

From the foregoing description of certain embodiments of this invention it should be evident to those skilled in the art that variouschanges .and modifications might be made without depart ing from the'spirit or scope of this invention. I claim: 7

1. A machine track member having a flat hOlir.

zontal top face terminating at one-side-in a longitudinal vertical shoulder, a hardened wear s ip Presenting hard top and edge faces seated on said face and bearing against said shoulder, and means for securing said strip in position ex- .draw said strip against said shoulder.

2. A machine track member having a flat horizontal top face terminating at one side in a longitudinal vertical shoulder, a hardened wear strip presenting hard top and edge faces seated on said face and bearing against said shoulder, and means for securing said strip in position including a threaded element engaging said track member and strip and extending beneath said shoulder. I

3. A machine track member having a flat horizontal top face terminating at one side in a longitudinal vertical shoulder, a hardened wear strip presenting hard top and edge faces seated on said face and bearing against said shoulder,

and screws passing through portions of said track member and threaded into said strip and inclined to the vertical to extend beneath said shoulder.

4. A machine track member having a'flat horizontal top face terminating at one side in a longitudinal vertical shoulder, a hardened wear strip. presenting hard top and edge faces seated on said face and bearing against said shoulder, and screws passing ,through portions of .said

track member and threaded into said strip, some of said screws being vertical and some inclined to the vertical in a direction to extend beneath said shoulder and pull saidstrip thereagainst, the vertical screws being more remote than the inclined screws from said shoulder.

5. A machine track member having a pair of flat top face portions and an upstanding rib therebetween, an edge strip presenting hard top and edge faces and having lower face portions resting on said top fiat faces and a, channel to receive said rib, said rib and channel having one side face of each accurately mated, and means for securing said strip in position including threaded elements passed upwardly through said track and into said strip, certain of said elements being inclined to the vertical and extending beneath said side faces and entering said .strip through that lower face portion adjacent to said mated side faces in position to'draw said mated faces together.

6. A machine track member having a pair of fiat top face portions and an upstanding rib therebetween, an edge strip presenting hard top and edge faces and having lower portions resting on said top flat faces and a channel to receive said rib, said rib and channel having one side face and a side edge face upstanding therefrom,

a wear strip presenting a hard top face and an outer edge face, and means for securing said wear strip in position exerting a component of pressure 'tendingto hold the adjacent side of said wear strip accurately against said upstanding side edge face.

JOHN E. LOVELY.

DISCL IMER- I 1,951,514.John E. Lovely, Springfield, Vt LATHE on THE LIKE. Patelit. dated March 20, 1934., Disclaimer filed July 28, 1942, by the assignee, Jones c6: Lamson Machine Company. Hereby enters this disclaimer to claims 1 and 7 in said specification.

. [Ofiicial Gazette August 25, 1942.] i 

